Window lock



Nov. 9, 1965 A. w. AI- ILGREN 3,215,756

WINDOW LOCK Filed May 9, 1963 2 Sheets-Sheet 1 5 xel ame/m r, M ,/Wd.u+0=.w

1965 A. w. AHLGREN 3,216,756

WINDOW LOCK Filed May 9, 1963 2 Sheets-Sheet 2 a? 26 2 21% I I4 15 235 27 qs F I I r I I r 1 z I I I I I a I 1 i I United States Patent 3,216,756 WINDOW LOCK Axel W. Ahlgren, Rockford, Ill., assignor to Amerock Corporation, Rockford, Ill., a corporation of Illinois Filed May 9, 1963, Ser- No. 279,149 1 Claim. (CL 292169) This invention relates to a window lock and particularly to a lock adapted to be used with a so-called sashless window, that is, a window in which two panes of glass are mounted directly in the window frame with at least one of the panes being slidable across the other pane to open the window. In such a window, the panes overlap when the window is closed and it is customary to lock the window by holding the movable pane against sliding and also to press the two panes against each other and against the frame to prevent air leakage and rattling.

The general object of the invention is to provide a novel window lock of the above character which bears against the panes resiliently so as to reduce the possibility of damage to the panes and to be eflfective in locking the window even though the lock is not accurately mounted on the frame.

The invention also resides in the novel construction which effectively prevents release of the lock by pressure being applied to the panes from the outside of the window.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawings, in which FIGURE 1 is a fragmentary perspective view of a sashless window employing the novel window lock of the present invention.

FIG. 2 is a top plan view of the lock.

FIG. 3 is a sectional view taken along the line 33 in FIG. 1.

: FIG. 4 is an enlarged sectional view taken along the line 4-4 in FIG. 3.

FIG. 5 is an enlarged sectional view taken along the line 55 in FIG. 3.

FIG. 6 is a perspective view of a part of the bolt of the lock.

FIG. 7 is a perspective view of another part of the bolt.

FIG. 8 is a sectional view similar to FIG. 3 but shows the parts in the unlocked position. I

As shown in the drawings for purposes of illustration, the invention is embodied in a lock 10 for a sashless window which includes two panes 11 and 12 of glass mounted in a frame 13. The pan 11 is stationary while the pane 12 slides back and forth horizontally in the frame to open and close one side of the window. When the window is closed, the inner side margin of the pane 12 overlaps the adjacent edge portion of the pane 11 on the inside as shown in FIG. 2 and the movable pane is held in this position by the lock 10.

To hold the pane 12, the lock 10 includes a bolt 14 which normally is in a retracted position inside a hollow casing 15 mounted on the sill 16 of the window and which may be projected toward the window panes to move in behind the inner edge of the pane 12 and prevent the latter from sliding open. The forward end of the bolt is cut away as indicated at 17 to form a shoulder 18 which engages the inside of the pane 12 and presses the latter against the pane 11 to prevent the panes from rattling. Preferably, both sides of the bolt are cut away to provide two shoulders and thereby accommodate right and left handed operating windows.

The bolt 14 is projected and retracted manually by turning a handle 19 journaled on top of the casing 15 about a vertical axis a which intersects the longitudinal center line of the bolt. Herein, the handle projects radially from an integral circular disk 20 which is formed with a depending flange 21 (FIG. 4) received in a hole 22 in boss 23 on the top of the casing 15. The flange 21 turns in the hole 22 about the axis a. An annular washer 24, which may be made of molded nylon, is disposed between the disk 20 and the boss 23 and the underside of the flange 21 is upset as indicated at 25 against a brass washer 26 beneath the boss to hold the flange in the hole 22.

If desired, the lock 10 may be arranged to hold the pane 12 not only in the closed position but also in one or two ventilating positions, that is, with the pane 12 partially opened. For this purpose, the casing 15, which may be a die casting with a stamped sheet metal bottom, is slidable endwise on a track 27 which is secured to the sill 16. The casing is held in the selected position relative to the track by a detent 28 which is carried by the casing and projects into slots 29 in the track, there being one slot for each position of adjustment. The detent may be a short bar slidable in an opening 30 in the casing and guided between two pins 31 (FIG. 3) rigid with the casing. A helical compression spring 32 acts between the pins and a shoulder 33 on the bar to urge the end of the bar outwardly through the opening 30 and into one of the slots 29. The bar may be retracted against the action of the spring 32 to permit the casing to be moved to any selected position of adjustment.

In accordance with the present invention, the lock 10 is constructed in a novel manner so that the bolt 14 bears against the inside of the pane 12 with a resilient rather than a positive pressure thereby reducing the chances of chipping or otherwise damaging the panes and also affording leeway in the mounting of the lock on the sill 16. Moreover, the novel arrangement effectively prevents unlocking by the application of a force on the outside of the panes. To these ends, the bolt 14 is constructed in two parts 34 and 35 with one part 34 projecting through an opening 36 in the casing 15 and the other part 35 operatively connected to the handle 19 and a spring 37 acts between the two parts so that movement of the handle is transmitted to the part 34 by the part 35 through the spring.

In the form shown in the drawings, the outer part or bolt member 34 is in the form of a hollow square sliding between spaced vertical walls 38 which are disposed on opposite sides of the opening 36. An integral projection 39 extends outwardly from the forward edge of the part 34 and is alined with the opening 36 to be projected therethrough as the part 34 slides forwardly between the walls 38, the shoulders 18 being formed on the outer end portion of the projection. The latter is only slightly smaller than the opening 36 so that the front edge of the member on each side of the projection abuts the front wall 40 of the casing 15 to limit the forward sliding of this member.

Disposed within the rectangular center hole 41 in the member 34 is the other part 35 of the bolt 14. This second part is a rectangular block which is as wide as the hole 41 transversely of the bolt but is narrower than the hole in the longitudinal direction. Thus, the part 35 is free for limited sliding relative to the part 34 in the longitudinal direction and also slides bodily with that part. The spring 37 urges the back side 42 and the inner part 35 back against the rear wall 43 of the hole 41 but yields to permit the inner part to slide forwardly relative to the outer part. For this purpose, the spring 37 may, as shown in the drawings, be of the compression type with one end seated against the forward face of the part 35 and held in position by a lug 44 integral with that part. The spring projects into a square bore 45 in the outer part where the other end of the spring seats against the end wall of the bore (see FIG. 4).

To project the bolt 14 in response to turning of the handle 19, a pin 46 which is integral with the handle and eccentric to the axis a of handle rotation projects down from the flange 21 and into a transverse slot 47 in the inner part 35 of the bolt. The slot extends from the center of the part 35 to the left as viewed in FIG. 3 and the pin 46 moves from its center position at one end of the slot to the opposite end of the slot and back each time the handle is turned either to project the bolt or to retract it. During each such movement, the handle 19 is turned through 180 degrees with the pin 46 being in front of the axis a when the bolt is projected as shown in FIGS. 3 and 4 and behind this axis when the bolt is retracted (see FIG. 8).

Thus, when the handle 19 is turned clockwise from the right hand position to the left hand position shown in FIG. 1, the pin 46 moves around the axis a from behind the axis (FIG. 8) to in front of it (FIG. 3), this being permitted by the slot 47. During this movement, the pin bears against the front wall of this slot and moves the inner part 35 forward. The part 35, in turn, acts through the spring 37 and moves the outer part 35 forward until the shoulder 18 engages the pane 12 after which the spring is compressed by the final movement of the inner part. As the pin is moved back by turning the handle in the opposite direction, the rear face 42 of the inner part 35 first is moved against the opposing surface 43 on the outer part 35 by the spring 37 and thereafter the two parts move back together to the retracted position.

With the foregoing arrangement, the projection 39 on the outer member 35, by virtue of the spring 37, bears yieldably against the pane 12, the spring being compressed somewhat when the bolt 14 is in the projected or locking position. This prevents damage to the pane and also permits some inaccuracy in the mounting of the lock 10 on the sill 16. Moreover, any pressure on the panes 11 and 12 from the outside merely compresses the spring 37 without disengaging the bolt from the pane 12 and thus the lock prevents unauthorized opening of the window. Normally, such compression of the spring does not produce a force great enough to turn the handle 19 back to the unlocked position but, as a precautionary measure, the invention contemplates the provision of special means to prevent turning of the handle. This means comprises a notch 48 (FIG. 3) in the forward wall of the slot 47 adjacent the inner end of the latter. When the assembly is in the locked position, the pin 46 is received in the notch 48 and the parts are held in this position by the spring 37. Further compression of the spring merely seats the pin more firmly in the notch which prevents the pin from moving ,laterally relative to the slot 47 in a direction to release the lock.

I claim as my invention:

A window lock comprising a hollow casing having an opening in one side thereof, a bolt having a body portion mounted within said casing to slide toward and away from said opening and an end portion rigid with said body portion and projecting through the opening, an abutment surface of predetermined length extending along one side of said end portion, said body portion having a hole therein defined by front and rear walls generally perpendicular to the direction in which the body slides and spaced apart a predetermined distance, a movable member disposed within said hole and being shorter than said predetermined distance, a spring acting between said bolt and said member and operable to urge said rear wall against said member thereby to leave a space between the member and said front wall, said space being shorter than the length of said abutment surface, a manual operator mounted on said casing to move from a first position to a second position, and a connection between said operator and said member operable to move the member forward as the operator is moved toward said second position, said spring transmitting the motion of said member to said bolt whereby said end portion is yieldably projected through said opening.

References Cited by the Examiner UNITED STATES PATENTS 2,578,004 12/51 Gifford 292-170 2,873,134 2/59 Ahlgren 292--1 2,922,297 1/ Hitzelberger 292-169 2,961,263 11/60 Ahlgren 292- FOREIGN PATENTS 1,142,526 1/53 Germany.

M. HENSON WOOD J R., Primary Examiner. 

